Locomotive stop valve



Oct. 30, 1928.

W. CASEY LOGOMOTIVE STOP VALVE vFiled July 21, 1927 n////kf hay INVENToR.

BY n

A TTORNEY.

Bil

Patented Oct. 30, 1928.

UNITED STATES` WILLIAM CASEY, OF KINGSTON, ONTARIO, CANADA.

LOCOMOTIVE Application filed July 21,

In modern locomotive practice, the arrangement is rapidly coming into favor by which the throttle means controlling the flow of steam to the steanrchests oiI the engines are located at a point between the superheater and the steam chests. rlfhis maires available at all times a supply of superheated steam ttor the operation of auxiliaries, and has certain other advantages such as promptor starting and stopping;` of the locomotive, smaller lilielihood ot slipping the wheels, etc. Under some conditions it niay be required, however, to have means to shut ofi the steam inlet to the superheater. It is the object of the present invention to supply improved means of this sort.

The invention is illustrated in the single sheet oit drawings herewith in which Fig. 1 shows in longitudinal central section such portions oi' a locomotive with my invention applied as are necessary to make the invention clear; Fig. 2 shows a section on an enlarged scale on line 2 2 otFig. 1; and Fig. 3 shows a section on line 3 3 ot' Fig. 2.

The barrel 1 ot the locomotive is equipped with the steam dome 2 into which extends the dry pipe 8 which conveys the steam tothe superheater header 1. The particular construction of the superheater is of no interest in the present connection, and is, therefore, not indicated in the dra-wings. It is understood by all those conversant with this art that the steam is returned to the superheater header 4; in a superheated state, and 'from it is conducted through the connections 5 (only one appearing in the drawing) to the steam chests ot the locomotive. The steam How to the connections 5 is controlled in the form of the drawings by a series oit' small valv .s 6 (only one of which shows in the drawings, the others lying in line directly behind it). These valves are. operated l'rom the cab by means oi a rod 7, arm El and shait 9.

This arrangement7 as mentioned above, is a typical one, and is used here only 'l'or illustrative purposes. TWhat is essential is that the steam is controlled by some form of throttling means between the outlet from the supcrheater and the engines. The shutoff valve can be applied anywhere in the dry pipe between its inlet and the superheater. In the forni of shutoli valve herein disclosed, the ,valve is placed so it shuts oit the steam at the very inlet to the dry pipe. The valve consists of' a flat disk 1() and a carrier member 22 and means for lowering it into the position so it STOP VALVE.

1927. l Serial No. 207,366.

.seats on the end of the dry pipe and for raising it up and out of the way for normal running of the locomotive.

The sheet 11 constituting the cover for opening 12 oit the steam dome is provided with a threaded hole 1B aligned centrally with the inlet of the dry pipe. Into this threaded hole is screwed the plug 14 through whose axial opening 15 extends the stem or rod 16. The plug' is preferably wel ded at 1.4L to make it steam tight. The lower end of the opening 15 liares out into a conical seat 17 against which may be seated the upper surface 1S o the collar 19. The surta-ce 1S is preferably given the shape of a spherical segment so that the sea` between 18 and 17 is substantially a circular line.. The upper end of the stem 16.is threaded, the threads being eno'aged by the corresponding threads of the castellated nut 20. 'I his nut when once in proper position is locked by means of the key 21 in the usual manner.

rllhe part ot the stem 1G below the collar 19 is threaded and engages the carrier 22, this carrier being internally threaded to rengage the threads on the stem. The carrier has an integral collar 23, the lower side of which in ,the shape of a spherical segment adapted to engage a seat surrounding the upper side `ot an opening 24E through the dise 10. The seat in the discr is Apreferably made conical in shape so that here also there is line Contact between the two seats. Ehe upper side oi the collar 23 is adapted to engage the cover 29 which is secured by means of the stud bolts 25 to the disc 10. The upper portion of the carrier and the opening in cover 29 through which it extends are square in cross-section. The lower end ot the stem 16 extends into the closed cavity 26 in the carrier 22. Studs 27-27 screwed. into the cover 11 and ears 28-28 integral with the disc 10 prevent the t valve from turning.

The operation of this device will readily be understooifl. When the valve is open as it is during normal operation of the locomotive, the nut 20 is pulled up s0 as to cause the two seats 18 and 1'? to engage. This prevents all leakage between the stem 16 and the plug 14.. The plug being welded in as at 14a prevents any leakage between the plug and the cover 11.

lVhen the valve is to be closed key 21 is removed and nut 2O is loosened sulliciently so that stem 16 can be turned. In the form illustrated this is done with a wrench applied to the squared upper portion. 1Ga of the stein 16, although obviously means permanently in place may be provided ttor this purpose, such as a wheel. Turning stem 16 in the proper direction lowers the valve, the studs 27 preventing its turning during this motion. The disc l() at this time is suspended on the collar by means of the cover 29. W hen the valve has been lowered sufficiently, it engages the upper edge of the dry pipe which tor this purpose is ground to a proper seat above described.

rllhe loosening olf nut 2O has broken the tight bearing between seats 18 and 1T. By further turning the stein i6 a'iter the valve has lzoeonie seated on the open end ot the dry pipe, carrier and cover 29 become disengaged, the former descendin and its lower surface engaging the seatsurrounding the opening ri further forcing of the stein 'lil forces these two seats together, and at the same time again seats i8 against the seat l?. lriealiage between stem 16 and plug le; and past carrier Q2 and disc l0 is thus ellectually prevented. lt will be obvious that some variations can be introduced into the invention as illustrated in the drawing, and described in the above specification, without departingfrom the spirit of the following claims.

l claim:

1. ln a locomotive, the combination of a steam dome comprising a dome sheet, a drypipe extending into the dome and having its end shaped to form a valve seat, a discshaped valve adapted to engage said seat, a plug in the donne sheet, a rod extendingr through the plug and having screw means adapted to operate the valve, a collar on said rod adapted to engage the plug to mal-:e a steam-'tight joint, said screw means adapted to force said collar against said plug when the valve is closee., and other screw means to force said collar against the plug when the valve is open.

2. In a locomotive, the combination of a steam dome comprising a dome sheet, a drypipe extendingl into the steam don-ie and having its end shaped to Yforni a valve seat, a disc-shaped valve adapted to engage said seat, a plug in the dome sheet, a rod extending through the plug and adapted to operate the valve, a collar on said rod adapted to seat against the inner end of the plug to forni a steam-tight joint, said rod having` a screw thread on its outer end, and a nut on said end, whereby the collar can be pulled up against the plug to make a tight joint and loosened to permit the rod to operate the valve.

3. The combination according to claim 2, the rod having another thread to force the valve to its seat and simultaneously to Atorce the collar against the plug.

4l. rlie combination'according te claim Q, the valve comprising a screw threaded element adapted to abut against the outer side oi the main cody portion oif the valve, the rod icing threaded to engage the thread el" said element, whereby a turning movement or the rod in the proper direction will 'force the collar against the plug and the element against said main body port-ion ol the valve and the valve against its seat.

5. in ya locomotive, the con'ibination et a steam dome comprising a dome smeet, drypipe extending into the steam dome and hav ingl its end shaped to ,torni a valve seat, a (flisc-sliaped valve adapted to engage said seat, a plug in the dome sheet, a. rod extending through the plug and adapted to operate the valve, a collar on said rod adapted to seat against the inner end of the plug to 'iorm a steam-tight joint, said rod having a screw thread on its outer end, a nut on said end, the main body portion ot said valve having a perforation alined with said rod, the outer end of the perforation having' a seat, a screwthreaded element forming a part oit the valve and having a corresponding seat to engage the seat at the perforation, a second element secured to said main body portion ol the valve and adapted to be engaged by the first element to lift the valve, said rod having a threaded portion to engage the screwthreaded eli-inient, and means to lice p the valve from rotating, whereby when the valve is open the collar may be pulled against the plug by means of the nut, and when the valve is closed the collar may be forced against the plug and the Erst-named element against the seat at the perforation and the valve against its seat by means of a rotation of the rod.

lVLLlAlvl CASEY. 

